MIN: move update of colortransform to dedicated function
MIN: move update of colortransform to dedicated function

RebeccaWPerry/vispy,jay3sh/vispy,RebeccaWPerry/vispy,QuLogic/vispy,sh4wn/vispy,bollu/vispy,jdreaver/vispy,dchilds7/Deysha-Star-Formation,kkuunnddaannkk/vispy,bollu/vispy,dchilds7/Deysha-Star-Formation,drufat/vispy,sbtlaarzc/vispy,drufat/vispy,kkuunnddaannkk/vispy,julienr/vispy,michaelaye/vispy,jay3sh/vispy,kkuunnddaannkk/vispy,Eric89GXL/vispy,dchilds7/Deysha-Star-Formation,michaelaye/vispy,Eric89GXL/vispy,inclement/vispy,sh4wn/vispy,julienr/vispy,drufat/vispy,michaelaye/vispy,srinathv/vispy,inclement/vispy,jdreaver/vispy,inclement/vispy,srinathv/vispy,ghisvail/vispy,QuLogic/vispy,ghisvail/vispy,sh4wn/vispy,srinathv/vispy,ghisvail/vispy,RebeccaWPerry/vispy,sbtlaarzc/vispy,QuLogic/vispy,bollu/vispy,Eric89GXL/vispy,sbtlaarzc/vispy,jdreaver/vispy,jay3sh/vispy,julienr/vispy